While Matthew had made contact with creatures that could use their inherent aura element, Matthew actually hadn't been aware of the existence of the inherent aura element before. But now that the system told him that such things exist and Matthew also has one, of course, Matthew was dying to know what is his inherent aura element.
Fortunately, the system didn't say something like 'information restricted' or told him that he needed to find out on his own.
'System, what is my inherent aura element?' He asked the system.
[Being a chameleon, host's inherent aura element is the Illusion element.]
'Illusion element? What does it do?'
[As its name implies, the illusion element is capable of creating constructs that seem real even though it's actually not.]